/*
 * Copyright 2010 Gal Dolber.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.unnison.framework.client.ga;

import com.google.gwt.dom.client.Document;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.ScriptElement;
import com.google.gwt.user.client.Window;

/**
 * Google analytics helper.
 */
public class GoogleAnalyticsImpl implements GoogleAnalytics {

    public GoogleAnalyticsImpl() {
    }

    public void setAccount(String ua) {
        // Inject the configuration code
        ScriptElement config = Document.get().createScriptElement(
            "var _gaq = _gaq || [];_gaq.push(['_setAccount', '" + ua + "']);_gaq.push(['_trackPageview']);");
        Element s = Document.get().getElementsByTagName("script").getItem(0);
        s.getParentNode().insertBefore(config, s);

        // Inject ga code
        ScriptElement script = Document.get().createScriptElement();
        script.setSrc(("https:".equals(Window.Location.getProtocol()) ? "https://ssl" : "http://www") + ".google-analytics.com/ga.js");
        script.setType("text/javascript");
        script.setAttribute("async", "");
        s.getParentNode().insertBefore(script, s);
    }

    public native void trackEvent(String category, String action) /*-{
                                                                  $wnd._gaq.push(['_trackEvent', category, action]);
                                                                  }-*/;

    public native void trackEvent(String category, String action, String opt_label, int opt_value) /*-{
                                                                                                   $wnd._gaq.push(['_trackEvent', category, action, opt_label, opt_value]);
                                                                                                   }-*/;

    public native void trackPageview() /*-{
                                       $wnd._gaq.push(['_trackPageview']);
                                       }-*/;

    public native void trackPageview(String pageName) /*-{
                                                      if (!pageName.match("^/")=="/") {
                                                      pageName = "/" + pageName;
                                                      }
                                                      $wnd._gaq.push(['_trackPageview', pageName]);
                                                      }-*/;
}
